ING5 and lung cancer: ING5 mRNA and protein levels were found to be differentially expressed in human lung cancer cell lines as compared to cell lines of healthy bronchial epithelial cells: Interestingly, in the 95D and H1299 cells, ING5 was expressed to a higher degree than in the normal bronchial epithelial cells, and in A549 and H1650 cells expression was lower [50].